Passive driver amplifier circuit

Published:2011/5/3 18:56:00 Author:Christina | Keyword: Passive driver, amplifier | From:SeekIC

The author made a heterogeneous amplifier which is composed of the old radio's output transformer and two FETs, use this amplifier with the AL007 sound card, the effect is good. This is one kind of simple amplifier and it is suitable for the beginners to copy. The circuit is as shown. Signal from the sound card gets into the transformer T primary stage (the original radio's output transformer is used as the input transformer, the original secondary stage transformer is used as the primary stage transformer), this signal is boosted by the transformer and gets into the FET through capacitors C1 and C2, the FET enlarges this signal to drive the speaker. The trick of this circuit is: uses the passive components voltage amplifier stage. For the low input impedance, this device can be only used to continue the low output impedance's signal. Power supply can work in ±6V～±24V voltage condition and you just need to adjust R1, R2 to keep the 30mA quiescent current.



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